diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ceb691a15b..e54bbb84b1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -410,6 +410,7 @@ jobs:
         board:
         - "espressif_saola_1_wroom"
         - "espressif_saola_1_wrover"
+        - "microdev_micro_s2"
         - "unexpectedmaker_feathers2"
 
     steps:
diff --git a/conf.py b/conf.py
index bd9e31d7f9..1d4c420481 100644
--- a/conf.py
+++ b/conf.py
@@ -42,6 +42,9 @@ master_doc = 'docs/index'
 # Grab the JSON values to use while building the module support matrix
 # in 'shared-bindings/index.rst'
 
+# The stubs must be built before we calculate the shared bindings matrix
+subprocess.check_output(["make", "stubs"])
+
 #modules_support_matrix = shared_bindings_matrix.support_matrix_excluded_boards()
 modules_support_matrix = shared_bindings_matrix.support_matrix_by_board()
 
@@ -77,7 +80,6 @@ source_suffix = {
     '.md': 'markdown',
 }
 
-subprocess.check_output(["make", "stubs"])
 extensions.append('autoapi.extension')
 
 autoapi_type = 'python'
diff --git a/docs/porting.rst b/docs/porting.rst
index db4ae76262..6cd59fefb1 100644
--- a/docs/porting.rst
+++ b/docs/porting.rst
@@ -51,10 +51,15 @@ as a natural "TODO" list. An example minimal build list is shown below:
 .. code-block:: makefile
 
     # These modules are implemented in ports/<port>/common-hal:
-    CIRCUITPY_MICROCONTROLLER = 0 # Typically the first module to create
-    CIRCUITPY_DIGITALIO = 0       # Typically the second module to create
+
+    # Typically the first module to create
+    CIRCUITPY_MICROCONTROLLER = 0
+    # Typically the second module to create
+    CIRCUITPY_DIGITALIO = 0
+    # Other modules:
     CIRCUITPY_ANALOGIO = 0
     CIRCUITPY_BUSIO = 0
+    CIRCUITPY_COUNTIO = 0
     CIRCUITPY_NEOPIXEL_WRITE = 0
     CIRCUITPY_PULSEIO = 0
     CIRCUITPY_OS = 0
@@ -63,22 +68,34 @@ as a natural "TODO" list. An example minimal build list is shown below:
     CIRCUITPY_AUDIOIO = 0
     CIRCUITPY_ROTARYIO = 0
     CIRCUITPY_RTC = 0
+    CIRCUITPY_SDCARDIO = 0
+    CIRCUITPY_FRAMEBUFFERIO = 0
     CIRCUITPY_FREQUENCYIO = 0
     CIRCUITPY_I2CPERIPHERAL = 0
-    CIRCUITPY_DISPLAYIO = 0       # Requires SPI, PulseIO (stub ok)
+    # Requires SPI, PulseIO (stub ok):
+    CIRCUITPY_DISPLAYIO = 0
 
     # These modules are implemented in shared-module/ - they can be included in
     # any port once their prerequisites in common-hal are complete.
-    CIRCUITPY_BITBANGIO = 0       # Requires DigitalIO
-    CIRCUITPY_GAMEPAD = 0         # Requires DigitalIO
-    CIRCUITPY_PIXELBUF = 0        # Requires neopixel_write or SPI (dotstar)
-    CIRCUITPY_RANDOM = 0          # Requires OS
-    CIRCUITPY_STORAGE = 0         # Requires OS, filesystem
-    CIRCUITPY_TOUCHIO = 0         # Requires Microcontroller
-    CIRCUITPY_USB_HID = 0         # Requires USB
-    CIRCUITPY_USB_MIDI = 0        # Requires USB
-    CIRCUITPY_REQUIRE_I2C_PULLUPS = 0 # Does nothing without I2C
-    CIRCUITPY_ULAB = 0            # No requirements, but takes extra flash
+    # Requires DigitalIO:
+    CIRCUITPY_BITBANGIO = 0
+    # Requires DigitalIO
+    CIRCUITPY_GAMEPAD = 0
+    # Requires neopixel_write or SPI (dotstar)
+    CIRCUITPY_PIXELBUF = 0
+    # Requires OS
+    CIRCUITPY_RANDOM = 0
+    # Requires OS, filesystem
+    CIRCUITPY_STORAGE = 0
+    # Requires Microcontroller
+    CIRCUITPY_TOUCHIO = 0
+    # Requires USB
+    CIRCUITPY_USB_HID = 0
+    CIRCUITPY_USB_MIDI = 0
+    # Does nothing without I2C
+    CIRCUITPY_REQUIRE_I2C_PULLUPS = 0
+    # No requirements, but takes extra flash
+    CIRCUITPY_ULAB = 0
 
 Step 2: Init
 --------------
diff --git a/docs/shared_bindings_matrix.py b/docs/shared_bindings_matrix.py
index 7b96c14f29..e81ae188c2 100644
--- a/docs/shared_bindings_matrix.py
+++ b/docs/shared_bindings_matrix.py
@@ -28,6 +28,7 @@ import re
 import subprocess
 import sys
 
+from concurrent.futures import ThreadPoolExecutor
 
 SUPPORTED_PORTS = ['atmel-samd', 'esp32s2', 'litex', 'mimxrt10xx', 'nrf', 'stm']
 
@@ -42,7 +43,7 @@ def get_circuitpython_root_dir():
 def get_shared_bindings():
     """ Get a list of modules in shared-bindings based on folder names
     """
-    shared_bindings_dir = get_circuitpython_root_dir() / "shared-bindings"
+    shared_bindings_dir = get_circuitpython_root_dir() / "circuitpython-stubs"
     return [item.name for item in shared_bindings_dir.iterdir()]
 
 
@@ -131,38 +132,44 @@ def lookup_setting(settings, key, default=''):
         key = value[2:-1]
     return value
 
+def all_ports_all_boards(ports=SUPPORTED_PORTS):
+    for port in ports:
+
+        port_dir = get_circuitpython_root_dir() / "ports" / port
+        for entry in (port_dir / "boards").iterdir():
+            if not entry.is_dir():
+                continue
+            yield (port, entry)
+
 def support_matrix_by_board(use_branded_name=True):
     """ Compiles a list of the available core modules available for each
         board.
     """
     base = build_module_map()
 
-    boards = dict()
-    for port in SUPPORTED_PORTS:
-
+    def support_matrix(arg):
+        port, entry = arg
         port_dir = get_circuitpython_root_dir() / "ports" / port
-        for entry in (port_dir / "boards").iterdir():
-            if not entry.is_dir():
-                continue
-            board_modules = []
-            board_name = entry.name
+        settings = get_settings_from_makefile(str(port_dir), entry.name)
 
-            settings = get_settings_from_makefile(str(port_dir), entry.name)
+        if use_branded_name:
+            with open(entry / "mpconfigboard.h") as get_name:
+                board_contents = get_name.read()
+            board_name_re = re.search(r"(?<=MICROPY_HW_BOARD_NAME)\s+(.+)",
+                                      board_contents)
+            if board_name_re:
+                board_name = board_name_re.group(1).strip('"')
 
-            if use_branded_name:
-                with open(entry / "mpconfigboard.h") as get_name:
-                    board_contents = get_name.read()
-                board_name_re = re.search(r"(?<=MICROPY_HW_BOARD_NAME)\s+(.+)",
-                                          board_contents)
-                if board_name_re:
-                    board_name = board_name_re.group(1).strip('"')
+        board_modules = []
+        for module in base:
+            key = f'CIRCUITPY_{module.upper()}'
+            if int(lookup_setting(settings, key, '0')):
+                board_modules.append(base[module]['name'])
 
-            board_modules = []
-            for module in base:
-                key = f'CIRCUITPY_{module.upper()}'
-                if int(lookup_setting(settings, key, '0')):
-                    board_modules.append(base[module]['name'])
-            boards[board_name] = sorted(board_modules)
+        return (board_name, sorted(board_modules))
+
+    executor = ThreadPoolExecutor(max_workers=os.cpu_count())
+    boards = dict(sorted(executor.map(support_matrix, all_ports_all_boards())))
 
     #print(json.dumps(boards, indent=2))
     return boards
diff --git a/lib/utils/pyexec.c b/lib/utils/pyexec.c
index 8e99bc2099..378fb6267d 100755
--- a/lib/utils/pyexec.c
+++ b/lib/utils/pyexec.c
@@ -113,6 +113,8 @@ STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input
         start = mp_hal_ticks_ms();
         mp_call_function_0(module_fun);
         mp_hal_set_interrupt_char(-1); // disable interrupt
+        // Handle any ctrl-c interrupt that arrived just in time
+        mp_handle_pending();
         nlr_pop();
         ret = 0;
         if (exec_flags & EXEC_FLAG_PRINT_EOF) {
diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index b7b442414b..2ba112d00e 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-08-25 16:39-0700\n"
+"POT-Creation-Date: 2020-08-27 11:21-0400\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -1349,8 +1349,8 @@ msgstr ""
 #: ports/nrf/common-hal/pulseio/PulseOut.c
 #: ports/stm/common-hal/pulseio/PulseOut.c
 msgid ""
-"Port does not accept pins or frequency.                                     "
-"Construct and pass a PWMOut Carrier instead"
+"Port does not accept pins or frequency. Construct and pass a PWMOut Carrier "
+"instead"
 msgstr ""
 
 #: shared-bindings/_bleio/Adapter.c
@@ -1365,6 +1365,10 @@ msgstr ""
 msgid "Pull not used when direction is output."
 msgstr ""
 
+#: ports/stm/ref/pulseout-pre-timeralloc.c
+msgid "PulseOut not supported on this chip"
+msgstr ""
+
 #: ports/stm/common-hal/os/__init__.c
 msgid "RNG DeInit Error"
 msgstr ""
diff --git a/ports/atmel-samd/common-hal/pulseio/PulseOut.c b/ports/atmel-samd/common-hal/pulseio/PulseOut.c
index 3463bb5e20..086052a973 100644
--- a/ports/atmel-samd/common-hal/pulseio/PulseOut.c
+++ b/ports/atmel-samd/common-hal/pulseio/PulseOut.c
@@ -101,8 +101,7 @@ void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
                                             uint32_t frequency,
                                             uint16_t duty_cycle) {
     if (!carrier || pin || frequency) {
-        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. \
-                                    Construct and pass a PWMOut Carrier instead"));
+        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. Construct and pass a PWMOut Carrier instead"));
     }
 
     if (refcount == 0) {
diff --git a/ports/cxd56/common-hal/pulseio/PulseOut.c b/ports/cxd56/common-hal/pulseio/PulseOut.c
index 764a5860a9..f08e7cd7a0 100644
--- a/ports/cxd56/common-hal/pulseio/PulseOut.c
+++ b/ports/cxd56/common-hal/pulseio/PulseOut.c
@@ -64,8 +64,7 @@ void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
                                             uint32_t frequency,
                                             uint16_t duty_cycle) {
     if (!carrier || pin || frequency) {
-        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. \
-                                    Construct and pass a PWMOut Carrier instead"));
+        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. Construct and pass a PWMOut Carrier instead"));
     }
 
     if (pulse_fd < 0) {
diff --git a/ports/esp32s2/boards/espressif_saola_1_wrover/sdkconfig b/ports/esp32s2/boards/espressif_saola_1_wrover/sdkconfig
index e69de29bb2..9d8bbde967 100644
--- a/ports/esp32s2/boards/espressif_saola_1_wrover/sdkconfig
+++ b/ports/esp32s2/boards/espressif_saola_1_wrover/sdkconfig
@@ -0,0 +1,33 @@
+CONFIG_ESP32S2_SPIRAM_SUPPORT=y
+
+#
+# SPI RAM config
+#
+# CONFIG_SPIRAM_TYPE_AUTO is not set
+CONFIG_SPIRAM_TYPE_ESPPSRAM16=y
+# CONFIG_SPIRAM_TYPE_ESPPSRAM32 is not set
+# CONFIG_SPIRAM_TYPE_ESPPSRAM64 is not set
+CONFIG_SPIRAM_SIZE=2097152
+
+#
+# PSRAM clock and cs IO for ESP32S2
+#
+CONFIG_DEFAULT_PSRAM_CLK_IO=30
+CONFIG_DEFAULT_PSRAM_CS_IO=26
+# end of PSRAM clock and cs IO for ESP32S2
+
+# CONFIG_SPIRAM_FETCH_INSTRUCTIONS is not set
+# CONFIG_SPIRAM_RODATA is not set
+# CONFIG_SPIRAM_SPEED_80M is not set
+CONFIG_SPIRAM_SPEED_40M=y
+# CONFIG_SPIRAM_SPEED_26M is not set
+# CONFIG_SPIRAM_SPEED_20M is not set
+CONFIG_SPIRAM=y
+CONFIG_SPIRAM_BOOT_INIT=y
+# CONFIG_SPIRAM_IGNORE_NOTFOUND is not set
+CONFIG_SPIRAM_USE_MEMMAP=y
+# CONFIG_SPIRAM_USE_CAPS_ALLOC is not set
+# CONFIG_SPIRAM_USE_MALLOC is not set
+CONFIG_SPIRAM_MEMTEST=y
+# CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY is not set
+# end of SPI RAM config
diff --git a/ports/esp32s2/boards/microdev_micro_s2/board.c b/ports/esp32s2/boards/microdev_micro_s2/board.c
new file mode 100644
index 0000000000..1dc30b5af8
--- /dev/null
+++ b/ports/esp32s2/boards/microdev_micro_s2/board.c
@@ -0,0 +1,56 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+#include "shared-bindings/microcontroller/Pin.h"
+
+void board_init(void) {
+    // USB
+    common_hal_never_reset_pin(&pin_GPIO19);
+    common_hal_never_reset_pin(&pin_GPIO20);
+
+    // Debug UART
+    common_hal_never_reset_pin(&pin_GPIO43);
+    common_hal_never_reset_pin(&pin_GPIO44);
+
+    // SPI Flash and RAM
+    common_hal_never_reset_pin(&pin_GPIO26);
+    common_hal_never_reset_pin(&pin_GPIO27);
+    common_hal_never_reset_pin(&pin_GPIO28);
+    common_hal_never_reset_pin(&pin_GPIO29);
+    common_hal_never_reset_pin(&pin_GPIO30);
+    common_hal_never_reset_pin(&pin_GPIO31);
+    common_hal_never_reset_pin(&pin_GPIO32);
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+
+}
diff --git a/ports/esp32s2/boards/microdev_micro_s2/mpconfigboard.h b/ports/esp32s2/boards/microdev_micro_s2/mpconfigboard.h
new file mode 100644
index 0000000000..bb28fe16ad
--- /dev/null
+++ b/ports/esp32s2/boards/microdev_micro_s2/mpconfigboard.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+//Micropython setup
+
+#define MICROPY_HW_BOARD_NAME       "microDev microS2"
+#define MICROPY_HW_MCU_NAME         "ESP32S2"
+
+#define MICROPY_HW_LED (&pin_GPIO21)
+#define MICROPY_HW_NEOPIXEL (&pin_GPIO33)
+
+#define AUTORESET_DELAY_MS 500
diff --git a/ports/esp32s2/boards/microdev_micro_s2/mpconfigboard.mk b/ports/esp32s2/boards/microdev_micro_s2/mpconfigboard.mk
new file mode 100644
index 0000000000..783e7ad4c7
--- /dev/null
+++ b/ports/esp32s2/boards/microdev_micro_s2/mpconfigboard.mk
@@ -0,0 +1,15 @@
+USB_VID = 0x239A
+USB_PID = 0x80C6
+USB_PRODUCT = "microS2"
+USB_MANUFACTURER = "microDev"
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = MPZ
+
+# The default queue depth of 16 overflows on release builds,
+# so increase it to 32.
+CFLAGS += -DCFG_TUD_TASK_QUEUE_SZ=32
+
+CIRCUITPY_ESP_FLASH_MODE=qio
+CIRCUITPY_ESP_FLASH_FREQ=40m
+CIRCUITPY_ESP_FLASH_SIZE=16MB
diff --git a/ports/esp32s2/boards/microdev_micro_s2/pins.c b/ports/esp32s2/boards/microdev_micro_s2/pins.c
new file mode 100644
index 0000000000..25300b5c3c
--- /dev/null
+++ b/ports/esp32s2/boards/microdev_micro_s2/pins.c
@@ -0,0 +1,49 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_IO0), MP_ROM_PTR(&pin_GPIO0) },
+    { MP_ROM_QSTR(MP_QSTR_IO1), MP_ROM_PTR(&pin_GPIO1) },
+    { MP_ROM_QSTR(MP_QSTR_IO2), MP_ROM_PTR(&pin_GPIO2) },
+    { MP_ROM_QSTR(MP_QSTR_IO3), MP_ROM_PTR(&pin_GPIO3) },
+    { MP_ROM_QSTR(MP_QSTR_IO4), MP_ROM_PTR(&pin_GPIO4) },
+    { MP_ROM_QSTR(MP_QSTR_IO5), MP_ROM_PTR(&pin_GPIO5) },
+    { MP_ROM_QSTR(MP_QSTR_IO6), MP_ROM_PTR(&pin_GPIO6) },
+    { MP_ROM_QSTR(MP_QSTR_IO7), MP_ROM_PTR(&pin_GPIO7) },
+    { MP_ROM_QSTR(MP_QSTR_IO8), MP_ROM_PTR(&pin_GPIO8) },
+    { MP_ROM_QSTR(MP_QSTR_IO9), MP_ROM_PTR(&pin_GPIO9) },
+    { MP_ROM_QSTR(MP_QSTR_IO10), MP_ROM_PTR(&pin_GPIO10) },
+    { MP_ROM_QSTR(MP_QSTR_IO11), MP_ROM_PTR(&pin_GPIO11) },
+    { MP_ROM_QSTR(MP_QSTR_IO12), MP_ROM_PTR(&pin_GPIO12) },
+    { MP_ROM_QSTR(MP_QSTR_IO13), MP_ROM_PTR(&pin_GPIO13) },
+    { MP_ROM_QSTR(MP_QSTR_IO14), MP_ROM_PTR(&pin_GPIO14) },
+    { MP_ROM_QSTR(MP_QSTR_IO15), MP_ROM_PTR(&pin_GPIO15) },
+    { MP_ROM_QSTR(MP_QSTR_IO16), MP_ROM_PTR(&pin_GPIO16) },
+    { MP_ROM_QSTR(MP_QSTR_IO17), MP_ROM_PTR(&pin_GPIO17) },
+    { MP_ROM_QSTR(MP_QSTR_IO18), MP_ROM_PTR(&pin_GPIO18) },
+    { MP_ROM_QSTR(MP_QSTR_IO19), MP_ROM_PTR(&pin_GPIO19) },
+    { MP_ROM_QSTR(MP_QSTR_IO20), MP_ROM_PTR(&pin_GPIO20) },
+    { MP_ROM_QSTR(MP_QSTR_IO21), MP_ROM_PTR(&pin_GPIO21) },
+    { MP_ROM_QSTR(MP_QSTR_IO26), MP_ROM_PTR(&pin_GPIO26) },
+    { MP_ROM_QSTR(MP_QSTR_IO33), MP_ROM_PTR(&pin_GPIO33) },
+    { MP_ROM_QSTR(MP_QSTR_IO34), MP_ROM_PTR(&pin_GPIO34) },
+    { MP_ROM_QSTR(MP_QSTR_IO35), MP_ROM_PTR(&pin_GPIO35) },
+    { MP_ROM_QSTR(MP_QSTR_IO36), MP_ROM_PTR(&pin_GPIO36) },
+    { MP_ROM_QSTR(MP_QSTR_IO37), MP_ROM_PTR(&pin_GPIO37) },
+    { MP_ROM_QSTR(MP_QSTR_IO38), MP_ROM_PTR(&pin_GPIO38) },
+    { MP_ROM_QSTR(MP_QSTR_IO39), MP_ROM_PTR(&pin_GPIO39) },
+    { MP_ROM_QSTR(MP_QSTR_IO40), MP_ROM_PTR(&pin_GPIO40) },
+    { MP_ROM_QSTR(MP_QSTR_IO41), MP_ROM_PTR(&pin_GPIO41) },
+    { MP_ROM_QSTR(MP_QSTR_IO42), MP_ROM_PTR(&pin_GPIO42) },
+    { MP_ROM_QSTR(MP_QSTR_IO43), MP_ROM_PTR(&pin_GPIO43) },
+    { MP_ROM_QSTR(MP_QSTR_IO44), MP_ROM_PTR(&pin_GPIO44) },
+    { MP_ROM_QSTR(MP_QSTR_IO45), MP_ROM_PTR(&pin_GPIO45) },
+    { MP_ROM_QSTR(MP_QSTR_IO46), MP_ROM_PTR(&pin_GPIO46) },
+
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_GPIO43) },
+    { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_GPIO44) },
+
+    { MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_GPIO21) },
+
+    { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO33) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_global_dict_table);
diff --git a/ports/esp32s2/boards/microdev_micro_s2/sdkconfig b/ports/esp32s2/boards/microdev_micro_s2/sdkconfig
new file mode 100644
index 0000000000..b73c4a8c20
--- /dev/null
+++ b/ports/esp32s2/boards/microdev_micro_s2/sdkconfig
@@ -0,0 +1,35 @@
+CONFIG_ESP32S2_SPIRAM_SUPPORT=y
+
+#
+# SPI RAM config
+#
+# CONFIG_SPIRAM_TYPE_AUTO is not set
+# CONFIG_SPIRAM_TYPE_ESPPSRAM16 is not set
+# CONFIG_SPIRAM_TYPE_ESPPSRAM32 is not set
+CONFIG_SPIRAM_TYPE_ESPPSRAM64=y
+CONFIG_SPIRAM_SIZE=8388608
+
+#
+# PSRAM clock and cs IO for ESP32S2
+#
+CONFIG_DEFAULT_PSRAM_CLK_IO=30
+CONFIG_DEFAULT_PSRAM_CS_IO=26
+# end of PSRAM clock and cs IO for ESP32S2
+
+CONFIG_SPIRAM_SPIWP_SD3_PIN=28
+# CONFIG_SPIRAM_FETCH_INSTRUCTIONS is not set
+# CONFIG_SPIRAM_RODATA is not set
+# CONFIG_SPIRAM_USE_AHB_DBUS3 is not set
+# CONFIG_SPIRAM_SPEED_80M is not set
+CONFIG_SPIRAM_SPEED_40M=y
+# CONFIG_SPIRAM_SPEED_26M is not set
+# CONFIG_SPIRAM_SPEED_20M is not set
+CONFIG_SPIRAM=y
+CONFIG_SPIRAM_BOOT_INIT=y
+# CONFIG_SPIRAM_IGNORE_NOTFOUND is not set
+CONFIG_SPIRAM_USE_MEMMAP=y
+# CONFIG_SPIRAM_USE_CAPS_ALLOC is not set
+# CONFIG_SPIRAM_USE_MALLOC is not set
+CONFIG_SPIRAM_MEMTEST=y
+# CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY is not set
+# end of SPI RAM config
diff --git a/ports/esp32s2/boards/unexpectedmaker_feathers2/sdkconfig b/ports/esp32s2/boards/unexpectedmaker_feathers2/sdkconfig
index e69de29bb2..b73c4a8c20 100644
--- a/ports/esp32s2/boards/unexpectedmaker_feathers2/sdkconfig
+++ b/ports/esp32s2/boards/unexpectedmaker_feathers2/sdkconfig
@@ -0,0 +1,35 @@
+CONFIG_ESP32S2_SPIRAM_SUPPORT=y
+
+#
+# SPI RAM config
+#
+# CONFIG_SPIRAM_TYPE_AUTO is not set
+# CONFIG_SPIRAM_TYPE_ESPPSRAM16 is not set
+# CONFIG_SPIRAM_TYPE_ESPPSRAM32 is not set
+CONFIG_SPIRAM_TYPE_ESPPSRAM64=y
+CONFIG_SPIRAM_SIZE=8388608
+
+#
+# PSRAM clock and cs IO for ESP32S2
+#
+CONFIG_DEFAULT_PSRAM_CLK_IO=30
+CONFIG_DEFAULT_PSRAM_CS_IO=26
+# end of PSRAM clock and cs IO for ESP32S2
+
+CONFIG_SPIRAM_SPIWP_SD3_PIN=28
+# CONFIG_SPIRAM_FETCH_INSTRUCTIONS is not set
+# CONFIG_SPIRAM_RODATA is not set
+# CONFIG_SPIRAM_USE_AHB_DBUS3 is not set
+# CONFIG_SPIRAM_SPEED_80M is not set
+CONFIG_SPIRAM_SPEED_40M=y
+# CONFIG_SPIRAM_SPEED_26M is not set
+# CONFIG_SPIRAM_SPEED_20M is not set
+CONFIG_SPIRAM=y
+CONFIG_SPIRAM_BOOT_INIT=y
+# CONFIG_SPIRAM_IGNORE_NOTFOUND is not set
+CONFIG_SPIRAM_USE_MEMMAP=y
+# CONFIG_SPIRAM_USE_CAPS_ALLOC is not set
+# CONFIG_SPIRAM_USE_MALLOC is not set
+CONFIG_SPIRAM_MEMTEST=y
+# CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY is not set
+# end of SPI RAM config
diff --git a/ports/esp32s2/common-hal/os/__init__.c b/ports/esp32s2/common-hal/os/__init__.c
index 17bda75ad3..4d6a6a2bfc 100644
--- a/ports/esp32s2/common-hal/os/__init__.c
+++ b/ports/esp32s2/common-hal/os/__init__.c
@@ -30,6 +30,8 @@
 #include "py/objtuple.h"
 #include "py/qstr.h"
 
+#include "esp_system.h"
+
 STATIC const qstr os_uname_info_fields[] = {
     MP_QSTR_sysname, MP_QSTR_nodename,
     MP_QSTR_release, MP_QSTR_version, MP_QSTR_machine
@@ -57,5 +59,15 @@ mp_obj_t common_hal_os_uname(void) {
 }
 
 bool common_hal_os_urandom(uint8_t* buffer, uint32_t length) {
-    return false;
+    uint32_t i = 0;
+    while (i < length) {
+        uint32_t new_random = esp_random();
+        for (int j = 0; j < 4 && i < length; j++) {
+            buffer[i] = new_random & 0xff;
+            i++;
+            new_random >>= 8;
+        }
+    }
+
+    return true;
 }
diff --git a/ports/esp32s2/common-hal/pulseio/PulseOut.c b/ports/esp32s2/common-hal/pulseio/PulseOut.c
index cfe750732b..e45492a893 100644
--- a/ports/esp32s2/common-hal/pulseio/PulseOut.c
+++ b/ports/esp32s2/common-hal/pulseio/PulseOut.c
@@ -37,8 +37,7 @@ void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
                                             uint32_t frequency,
                                             uint16_t duty_cycle) {
     if (carrier || !pin || !frequency) {
-        mp_raise_NotImplementedError(translate("Port does not accept PWM carrier. \
-                                    Pass a pin, frequency and duty cycle instead"));
+        mp_raise_NotImplementedError(translate("Port does not accept PWM carrier. Pass a pin, frequency and duty cycle instead"));
     }
 
     rmt_channel_t channel = esp32s2_peripherals_find_and_reserve_rmt();
diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index c039b14477..89ab166d51 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -44,11 +44,15 @@
 #include "supervisor/memory.h"
 #include "supervisor/shared/tick.h"
 
+#include "peripherals/rmt.h"
 #include "esp-idf/components/heap/include/esp_heap_caps.h"
-#include "rmt.h"
+#include "esp-idf/components/soc/soc/esp32s2/include/soc/cache_memory.h"
 
 #define HEAP_SIZE (48 * 1024)
 
+uint32_t* heap;
+uint32_t heap_size;
+
 STATIC esp_timer_handle_t _tick_timer;
 
 void tick_timer_cb(void* arg) {
@@ -67,6 +71,16 @@ safe_mode_t port_init(void) {
 
     heap = malloc(HEAP_SIZE);
     never_reset_module_internal_pins();
+
+    #ifdef CONFIG_SPIRAM
+        heap = (uint32_t*) (DRAM0_CACHE_ADDRESS_HIGH - CONFIG_SPIRAM_SIZE);
+        heap_size = CONFIG_SPIRAM_SIZE / sizeof(uint32_t);
+    #endif
+
+    if (heap == NULL) {
+        heap = malloc(HEAP_SIZE);
+        heap_size = HEAP_SIZE / sizeof(uint32_t);
+    }
     return NO_SAFE_MODE;
 }
 
@@ -106,7 +120,7 @@ uint32_t *port_heap_get_bottom(void) {
 }
 
 uint32_t *port_heap_get_top(void) {
-    return heap + (HEAP_SIZE / sizeof(uint32_t));
+    return heap + heap_size;
 }
 
 uint32_t *port_stack_get_limit(void) {
diff --git a/ports/nrf/common-hal/pulseio/PulseOut.c b/ports/nrf/common-hal/pulseio/PulseOut.c
index 9f301a7306..f40dbea5c8 100644
--- a/ports/nrf/common-hal/pulseio/PulseOut.c
+++ b/ports/nrf/common-hal/pulseio/PulseOut.c
@@ -105,8 +105,7 @@ void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
                                             uint32_t frequency,
                                             uint16_t duty_cycle) {
     if (!carrier || pin || frequency) {
-        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. \
-                                    Construct and pass a PWMOut Carrier instead"));
+        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. Construct and pass a PWMOut Carrier instead"));
     }
 
     if (refcount == 0) {
diff --git a/ports/stm/boards/espruino_pico/mpconfigboard.mk b/ports/stm/boards/espruino_pico/mpconfigboard.mk
index 201237c9d6..b1b023dd58 100644
--- a/ports/stm/boards/espruino_pico/mpconfigboard.mk
+++ b/ports/stm/boards/espruino_pico/mpconfigboard.mk
@@ -10,7 +10,8 @@ MCU_VARIANT = STM32F401xE
 MCU_PACKAGE = UFQFPN48
 
 LD_COMMON = boards/common_default.ld
-LD_FILE = boards/STM32F401xd_fs.ld # use for internal flash
+# use for internal flash
+LD_FILE = boards/STM32F401xd_fs.ld
 
 # Disable ulab as we're nearly out of space on this board due to
 # INTERNAL_FLASH_FILESYSTEM.  It can probably be reenabled if we enable
diff --git a/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
index 2b2c0d6db5..4d0bd4598d 100644
--- a/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
+++ b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
@@ -13,5 +13,6 @@ MCU_PACKAGE = LQFP64
 
 LD_COMMON = boards/common_default.ld
 LD_DEFAULT = boards/STM32F405_default.ld
-LD_BOOT = boards/STM32F405_boot.ld # UF2 boot option
+# UF2 boot option
+LD_BOOT = boards/STM32F405_boot.ld
 UF2_OFFSET = 0x8010000
diff --git a/ports/stm/boards/meowbit_v121/mpconfigboard.mk b/ports/stm/boards/meowbit_v121/mpconfigboard.mk
index 852836ef8f..a638183019 100644
--- a/ports/stm/boards/meowbit_v121/mpconfigboard.mk
+++ b/ports/stm/boards/meowbit_v121/mpconfigboard.mk
@@ -18,4 +18,5 @@ OPTIMIZATION_FLAGS = -Os
 
 LD_COMMON = boards/common_default.ld
 LD_FILE = boards/STM32F401xe_boot.ld
-# LD_FILE = boards/STM32F401xe_fs.ld # use for internal flash
+# use for internal flash
+# LD_FILE = boards/STM32F401xe_fs.ld
diff --git a/ports/stm/common-hal/os/__init__.c b/ports/stm/common-hal/os/__init__.c
index 84deb81759..8da7243a30 100644
--- a/ports/stm/common-hal/os/__init__.c
+++ b/ports/stm/common-hal/os/__init__.c
@@ -72,16 +72,20 @@ bool common_hal_os_urandom(uint8_t *buffer, uint32_t length) {
     if (HAL_RNG_Init(&handle) != HAL_OK) mp_raise_ValueError(translate("RNG Init Error"));
 
     //Assign bytes
-    for (uint i = 0; i < length; i++) {
-        uint32_t temp;
+    uint32_t i = 0;
+    while (i < length) {
+        uint32_t new_random;
         uint32_t start = HAL_GetTick();
         //the HAL function has a timeout, but it isn't long enough, and isn't adjustable
         while(!(__HAL_RNG_GET_FLAG(&handle,RNG_FLAG_DRDY)) && ((HAL_GetTick() - start) < RNG_TIMEOUT));
-        //
-        if (HAL_RNG_GenerateRandomNumber(&handle, &temp) != HAL_OK) {
+        if (HAL_RNG_GenerateRandomNumber(&handle, &new_random) != HAL_OK) {
             mp_raise_ValueError(translate("Random number generation error"));
         }
-        *buffer = (uint8_t)temp;
+        for (int j = 0; j < 4 && i < length; j++) {
+            buffer[i] = new_random & 0xff;
+            i++;
+            new_random >>= 8;
+        }
     }
 
     //shut down the peripheral
diff --git a/ports/stm/common-hal/pulseio/PulseOut.c b/ports/stm/common-hal/pulseio/PulseOut.c
index 3bf23ad14b..963aee721a 100644
--- a/ports/stm/common-hal/pulseio/PulseOut.c
+++ b/ports/stm/common-hal/pulseio/PulseOut.c
@@ -118,8 +118,7 @@ void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
                                             uint32_t frequency,
                                             uint16_t duty_cycle) {
     if (!carrier || pin || frequency) {
-        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. \
-                                    Construct and pass a PWMOut Carrier instead"));
+        mp_raise_NotImplementedError(translate("Port does not accept pins or frequency. Construct and pass a PWMOut Carrier instead"));
     }
 
     // Add to active PulseOuts
diff --git a/py/obj.c b/py/obj.c
index 0cff2f1a4b..9dc0cf4749 100644
--- a/py/obj.c
+++ b/py/obj.c
@@ -67,6 +67,8 @@ void mp_obj_print_helper(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t
     #ifdef RUN_BACKGROUND_TASKS
     RUN_BACKGROUND_TASKS;
     #endif
+    mp_handle_pending();
+
 #ifndef NDEBUG
     if (o_in == MP_OBJ_NULL) {
         mp_print_str(print, "(nil)");
diff --git a/supervisor/shared/micropython.c b/supervisor/shared/micropython.c
index 245db11d42..bbc4807f97 100644
--- a/supervisor/shared/micropython.c
+++ b/supervisor/shared/micropython.c
@@ -29,14 +29,24 @@
 #include "supervisor/serial.h"
 #include "lib/oofatfs/ff.h"
 #include "py/mpconfig.h"
+#include "py/mpstate.h"
+#include "py/runtime.h"
 
 #include "supervisor/shared/status_leds.h"
 
+#if CIRCUITPY_WATCHDOG
+#include "shared-bindings/watchdog/__init__.h"
+#define WATCHDOG_EXCEPTION_CHECK() (MP_STATE_VM(mp_pending_exception) == &mp_watchdog_timeout_exception)
+#else
+#define WATCHDOG_EXCEPTION_CHECK() 0
+#endif
+
 int mp_hal_stdin_rx_chr(void) {
     for (;;) {
         #ifdef MICROPY_VM_HOOK_LOOP
             MICROPY_VM_HOOK_LOOP
         #endif
+        mp_handle_pending();
         if (serial_bytes_available()) {
             toggle_rx_led();
             return serial_read();
diff --git a/supervisor/shared/tick.c b/supervisor/shared/tick.c
index 4af59f78e3..f26e1e79d1 100644
--- a/supervisor/shared/tick.c
+++ b/supervisor/shared/tick.c
@@ -27,6 +27,7 @@
 #include "supervisor/shared/tick.h"
 
 #include "py/mpstate.h"
+#include "py/runtime.h"
 #include "supervisor/linker.h"
 #include "supervisor/filesystem.h"
 #include "supervisor/background_callback.h"
@@ -149,17 +150,7 @@ void mp_hal_delay_ms(mp_uint_t delay) {
     while (remaining > 0) {
         RUN_BACKGROUND_TASKS;
         // Check to see if we've been CTRL-Ced by autoreload or the user.
-        if(MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)))
-           {
-            // clear exception and generate stacktrace
-            MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
-            nlr_raise(&MP_STATE_VM(mp_kbd_exception));
-          }
-        if( MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception)) ||
-           WATCHDOG_EXCEPTION_CHECK()) {
-            // stop sleeping immediately
-            break;
-        }
+        mp_handle_pending();
         remaining = end_tick - port_get_raw_ticks(NULL);
         // We break a bit early so we don't risk setting the alarm before the time when we call
         // sleep.
diff --git a/tools/mpconfig_category_reader.py b/tools/mpconfig_category_reader.py
new file mode 100644
index 0000000000..2f813931e8
--- /dev/null
+++ b/tools/mpconfig_category_reader.py
@@ -0,0 +1,31 @@
+filepath = '../py/circuitpy_mpconfig.mk'
+with open(filepath) as fp:
+    line = fp.readline()
+    cnt = 1
+    fullbuild = []
+    defon = []
+    defoff = []
+    while line:
+        wordlist = line.split()
+        if wordlist:
+            if wordlist[-1] == "$(CIRCUITPY_FULL_BUILD)":
+                fullbuild.append(wordlist[0])
+            elif wordlist[-1] == "0":
+                defoff.append(wordlist[0])
+            elif wordlist[-1] == "1":
+                defon.append(wordlist[0])
+        line = fp.readline()
+        cnt += 1
+
+    print(str(cnt) + " Lines Read\n")
+    print("\nFULL BUILDS ------------------------")
+    for string in fullbuild:
+        print(string)
+
+    print("\nON BUILDS ------------------------")
+    for string in defon:
+        print(string)
+
+    print("\nOFF BUILDS ------------------------")
+    for string in defoff:
+        print(string)